It was found that the raw midi kernel driver does not protect against concurrent access which leads to a double realloc (double free) in snd_rawmidi_input_params() and snd_rawmidi_output_status() which are part of snd_rawmidi_ioctl() handler in rawmidi.c file. A malicious local attacker could possibly use this for privilege escalation.

Statement:
This flaw affects all current shipping releases of Red Hat Enterprise Linux. This flaw requires real or emulated midi hardware available in the system. Fixes will be delivered when available.